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Old 08-27-2012, 03:52 AM   #1
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ATF quantity for radiator swap

Hi guys.

I am about to replace my radiator as it is seeping some fluid at the top reservoir. I have and 42RLE transmission so the ATF flows through the rad at the bottom.

How much fluid will I lose and do I need to clamp the bottom pipes closed to prevent more fluid from draining out while I install the new radiator?

The reason I am asking is because the MOPAR ATF +4 is the only ATF+4 available in my courtry and it comes at a premium so I only want to buy what I need.

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2003 Wrangler Sahara 4.0 42rle D30/D44
Front: 2" BDS coils + JKU shocks
Rear: 2" BB + Zone Nitro shocks
Zone 1.25" BL + 1" MML, UCF LoPro
32" BFG AT on 16" Racing Hart
Ramsey Pro Plus 6000, IPF 900s 130W
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Old 08-27-2012, 06:07 AM   #2
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About a quart should do it. Was all I needed when I replaced mine. (actually a little less)

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Old 08-27-2012, 06:18 AM   #3
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Quote:
Originally Posted by Tdog02 View Post
About a quart should do it. Was all I needed when I replaced mine. (actually a little less)
Great thanks
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2003 Wrangler Sahara 4.0 42rle D30/D44
Front: 2" BDS coils + JKU shocks
Rear: 2" BB + Zone Nitro shocks
Zone 1.25" BL + 1" MML, UCF LoPro
32" BFG AT on 16" Racing Hart
Ramsey Pro Plus 6000, IPF 900s 130W
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Old 08-27-2012, 08:04 AM   #4
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Quote:
Originally Posted by Tdog02 View Post
About a quart should do it.
If you clamp or plug the hoses, you can substantially reduce that amount.

Quote:
Originally Posted by Rolf View Post
...do I need to clamp the bottom pipes closed to prevent more fluid from draining out while I install the new radiator?
Yes.
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Old 08-27-2012, 12:28 PM   #5
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Personally I'd let it drain until it stops on its own. That's a great way to do a partial ATF change which is never a bad idea. Top it back off with ATF+4.
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Old 08-27-2012, 01:59 PM   #6
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Originally Posted by Jerry Bransford
Personally I'd let it drain until it stops on its own. That's a great way to do a partial ATF change which is never a bad idea. Top it back off with ATF+4.
That makes perfect sense and I would not mind doing that but money is tight at the moment -2nd little one on the way in 6 weeks. Atleast I did an atf and filter change 2500 miles ago.
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2003 Wrangler Sahara 4.0 42rle D30/D44
Front: 2" BDS coils + JKU shocks
Rear: 2" BB + Zone Nitro shocks
Zone 1.25" BL + 1" MML, UCF LoPro
32" BFG AT on 16" Racing Hart
Ramsey Pro Plus 6000, IPF 900s 130W
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Old 08-27-2012, 02:02 PM   #7
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I wouldn't do a partial change either after only 2500 miles, congrats on the upcoming blessed event!
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Old 08-27-2012, 02:56 PM   #8
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Quote:
Originally Posted by Jerry Bransford
I wouldn't do a partial change either after only 2500 miles, congrats on the upcoming blessed event!
Thanks. We are very excited!

Should receive my new rad tomorrow and then I need to install the new one before Saturday - taking my wife and 3 year old boy to a Jeep Spring day. 1 September is officially spring over here. At this point we have 60 confirmed Jeeps attending this day which we are thinking would be some kind of record over here.
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2003 Wrangler Sahara 4.0 42rle D30/D44
Front: 2" BDS coils + JKU shocks
Rear: 2" BB + Zone Nitro shocks
Zone 1.25" BL + 1" MML, UCF LoPro
32" BFG AT on 16" Racing Hart
Ramsey Pro Plus 6000, IPF 900s 130W
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Old 08-27-2012, 05:27 PM   #9
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I changed mine ('01), and had no fluid leak out at all. Checked everything after the leak check and all the levels were still good. I was/am confused, but it is what it is.

You all are going to go make me check it again, lol. It's time to check it anyway.
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Old 08-29-2012, 01:44 AM   #10
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So I replaced the radiator last night. I only lost around 150ml (5 US fluid ounces) of ATF.
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2003 Wrangler Sahara 4.0 42rle D30/D44
Front: 2" BDS coils + JKU shocks
Rear: 2" BB + Zone Nitro shocks
Zone 1.25" BL + 1" MML, UCF LoPro
32" BFG AT on 16" Racing Hart
Ramsey Pro Plus 6000, IPF 900s 130W
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Old 08-31-2012, 11:59 AM   #11
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Changed my radiator and a friend's a few weeks ago. Mine is a 1997 2.5 auto, his is a 2000 2.5 auto. Only lost a few ounces if that.

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